1. Open the FLIR App
Mount phone into monitoring location/tripod that will allow people to pass by at a maximum of 1.5m away facing the camera as straight on as possible.
Set the Colour palette to "Iron" if it's not already selected.
2. Tap the calibration icon
Tap the temperature gradient icon (fourth icon in from the top left) so the visible temperature bar appears to the right of the screen.
The sensor will now automatically calibrate.
3. Tap the top temperature
Enter 34°C or 93°F and tap the tick icon to confirm. Tap the lower temperature at the bottom of the chart to edit and lock it.
Enter 32°C or 89°F and tap the tick icon to confirm.
Wait for 2-3 minutes before use as the accuracy will increase as the sensor warms up.
Note: The display will now only show temperatures between these two temperatures. Anything lower will be black, anything higher will be white. Anything showing up with a colour or white will be highlighting an elevated temperature.